/usr/lib/python3/dist-packages/aiohttp/connector.py is in python3-aiohttp 3.0.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import functools
import sys
import traceback
import warnings
from collections import defaultdict
from contextlib import suppress
from http.cookies import SimpleCookie
from itertools import cycle, islice
from time import monotonic
from . import hdrs, helpers
from .client_exceptions import (ClientConnectionError,
ClientConnectorCertificateError,
ClientConnectorError, ClientConnectorSSLError,
ClientHttpProxyError,
ClientProxyConnectionError,
ServerFingerprintMismatch, certificate_errors,
ssl_errors)
from .client_proto import ResponseHandler
from .client_reqrep import ClientRequest, Fingerprint, _merge_ssl_params
from .helpers import PY_36, is_ip_address, noop, sentinel
from .locks import EventResultOrError
from .resolver import DefaultResolver
try:
import ssl
except ImportError: # pragma: no cover
ssl = None
__all__ = ('BaseConnector', 'TCPConnector', 'UnixConnector')
class Connection:
_source_traceback = None
_transport = None
def __init__(self, connector, key, protocol, loop):
self._key = key
self._connector = connector
self._loop = loop
self._protocol = protocol
self._callbacks = []
if loop.get_debug():
self._source_traceback = traceback.extract_stack(sys._getframe(1))
def __repr__(self):
return 'Connection<{}>'.format(self._key)
def __del__(self, _warnings=warnings):
if self._protocol is not None:
if PY_36:
kwargs = {'source': self}
else:
kwargs = {}
_warnings.warn('Unclosed connection {!r}'.format(self),
ResourceWarning,
**kwargs)
if self._loop.is_closed():
return
self._connector._release(
self._key, self._protocol, should_close=True)
context = {'client_connection': self,
'message': 'Unclosed connection'}
if self._source_traceback is not None:
context['source_traceback'] = self._source_traceback
self._loop.call_exception_handler(context)
@property
def loop(self):
return self._loop
@property
def transport(self):
return self._protocol.transport
@property
def protocol(self):
return self._protocol
@property
def writer(self):
return self._protocol.writer
def add_callback(self, callback):
if callback is not None:
self._callbacks.append(callback)
def _notify_release(self):
callbacks, self._callbacks = self._callbacks[:], []
for cb in callbacks:
with suppress(Exception):
cb()
def close(self):
self._notify_release()
if self._protocol is not None:
self._connector._release(
self._key, self._protocol, should_close=True)
self._protocol = None
def release(self):
self._notify_release()
if self._protocol is not None:
self._connector._release(
self._key, self._protocol,
should_close=self._protocol.should_close)
self._protocol = None
def detach(self):
self._notify_release()
if self._protocol is not None:
self._connector._release_acquired(self._protocol)
self._protocol = None
@property
def closed(self):
return self._protocol is None or not self._protocol.is_connected()
class _TransportPlaceholder:
""" placeholder for BaseConnector.connect function """
def close(self):
pass
class BaseConnector:
"""Base connector class.
keepalive_timeout - (optional) Keep-alive timeout.
force_close - Set to True to force close and do reconnect
after each request (and between redirects).
limit - The total number of simultaneous connections.
limit_per_host - Number of simultaneous connections to one host.
enable_cleanup_closed - Enables clean-up closed ssl transports.
Disabled by default.
loop - Optional event loop.
"""
_closed = True # prevent AttributeError in __del__ if ctor was failed
_source_traceback = None
# abort transport after 2 seconds (cleanup broken connections)
_cleanup_closed_period = 2.0
def __init__(self, *, keepalive_timeout=sentinel,
force_close=False, limit=100, limit_per_host=0,
enable_cleanup_closed=False, loop=None):
if force_close:
if keepalive_timeout is not None and \
keepalive_timeout is not sentinel:
raise ValueError('keepalive_timeout cannot '
'be set if force_close is True')
else:
if keepalive_timeout is sentinel:
keepalive_timeout = 15.0
if loop is None:
loop = asyncio.get_event_loop()
self._closed = False
if loop.get_debug():
self._source_traceback = traceback.extract_stack(sys._getframe(1))
self._conns = {}
self._limit = limit
self._limit_per_host = limit_per_host
self._acquired = set()
self._acquired_per_host = defaultdict(set)
self._keepalive_timeout = keepalive_timeout
self._force_close = force_close
self._waiters = defaultdict(list)
self._loop = loop
self._factory = functools.partial(ResponseHandler, loop=loop)
self.cookies = SimpleCookie()
# start keep-alive connection cleanup task
self._cleanup_handle = None
# start cleanup closed transports task
self._cleanup_closed_handle = None
self._cleanup_closed_disabled = not enable_cleanup_closed
self._cleanup_closed_transports = []
self._cleanup_closed()
def __del__(self, _warnings=warnings):
if self._closed:
return
if not self._conns:
return
conns = [repr(c) for c in self._conns.values()]
self.close()
if PY_36:
kwargs = {'source': self}
else:
kwargs = {}
_warnings.warn("Unclosed connector {!r}".format(self),
ResourceWarning,
**kwargs)
context = {'connector': self,
'connections': conns,
'message': 'Unclosed connector'}
if self._source_traceback is not None:
context['source_traceback'] = self._source_traceback
self._loop.call_exception_handler(context)
def __enter__(self):
return self
def __exit__(self, *exc):
self.close()
@property
def force_close(self):
"""Ultimately close connection on releasing if True."""
return self._force_close
@property
def limit(self):
"""The total number for simultaneous connections.
If limit is 0 the connector has no limit.
The default limit size is 100.
"""
return self._limit
@property
def limit_per_host(self):
"""The limit_per_host for simultaneous connections
to the same endpoint.
Endpoints are the same if they are have equal
(host, port, is_ssl) triple.
"""
return self._limit_per_host
def _cleanup(self):
"""Cleanup unused transports."""
if self._cleanup_handle:
self._cleanup_handle.cancel()
now = self._loop.time()
timeout = self._keepalive_timeout
if self._conns:
connections = {}
deadline = now - timeout
for key, conns in self._conns.items():
alive = []
for proto, use_time in conns:
if proto.is_connected():
if use_time - deadline < 0:
transport = proto.close()
if key[-1] and not self._cleanup_closed_disabled:
self._cleanup_closed_transports.append(
transport)
else:
alive.append((proto, use_time))
if alive:
connections[key] = alive
self._conns = connections
if self._conns:
self._cleanup_handle = helpers.weakref_handle(
self, '_cleanup', timeout, self._loop)
def _drop_acquired_per_host(self, key, val):
acquired_per_host = self._acquired_per_host
if key not in acquired_per_host:
return
conns = acquired_per_host[key]
conns.remove(val)
if not conns:
del self._acquired_per_host[key]
def _cleanup_closed(self):
"""Double confirmation for transport close.
Some broken ssl servers may leave socket open without proper close.
"""
if self._cleanup_closed_handle:
self._cleanup_closed_handle.cancel()
for transport in self._cleanup_closed_transports:
if transport is not None:
transport.abort()
self._cleanup_closed_transports = []
if not self._cleanup_closed_disabled:
self._cleanup_closed_handle = helpers.weakref_handle(
self, '_cleanup_closed',
self._cleanup_closed_period, self._loop)
def close(self):
"""Close all opened transports."""
if self._closed:
return
self._closed = True
try:
if self._loop.is_closed():
return noop()
# cancel cleanup task
if self._cleanup_handle:
self._cleanup_handle.cancel()
# cancel cleanup close task
if self._cleanup_closed_handle:
self._cleanup_closed_handle.cancel()
for data in self._conns.values():
for proto, t0 in data:
proto.close()
for proto in self._acquired:
proto.close()
for transport in self._cleanup_closed_transports:
if transport is not None:
transport.abort()
finally:
self._conns.clear()
self._acquired.clear()
self._waiters.clear()
self._cleanup_handle = None
self._cleanup_closed_transports.clear()
self._cleanup_closed_handle = None
@property
def closed(self):
"""Is connector closed.
A readonly property.
"""
return self._closed
async def connect(self, req, traces=None):
"""Get from pool or create new connection."""
key = req.connection_key
if self._limit:
# total calc available connections
available = self._limit - len(self._acquired)
# check limit per host
if (self._limit_per_host and available > 0 and
key in self._acquired_per_host):
available = self._limit_per_host - len(
self._acquired_per_host.get(key))
elif self._limit_per_host and key in self._acquired_per_host:
# check limit per host
available = self._limit_per_host - len(
self._acquired_per_host.get(key))
else:
available = 1
# Wait if there are no available connections.
if available <= 0:
fut = self._loop.create_future()
# This connection will now count towards the limit.
waiters = self._waiters[key]
waiters.append(fut)
if traces:
for trace in traces:
await trace.send_connection_queued_start()
try:
await fut
finally:
# remove a waiter even if it was cancelled
waiters.remove(fut)
if not waiters:
del self._waiters[key]
if traces:
for trace in traces:
await trace.send_connection_queued_end()
proto = self._get(key)
if proto is None:
placeholder = _TransportPlaceholder()
self._acquired.add(placeholder)
self._acquired_per_host[key].add(placeholder)
if traces:
for trace in traces:
await trace.send_connection_create_start()
try:
proto = await self._create_connection(
req,
traces=traces
)
if self._closed:
proto.close()
raise ClientConnectionError("Connector is closed.")
except BaseException:
# signal to waiter
if key in self._waiters:
for waiter in self._waiters[key]:
if not waiter.done():
waiter.set_result(None)
break
raise
finally:
if not self._closed:
self._acquired.remove(placeholder)
self._drop_acquired_per_host(key, placeholder)
if traces:
for trace in traces:
await trace.send_connection_create_end()
else:
if traces:
for trace in traces:
await trace.send_connection_reuseconn()
self._acquired.add(proto)
self._acquired_per_host[key].add(proto)
return Connection(self, key, proto, self._loop)
def _get(self, key):
try:
conns = self._conns[key]
except KeyError:
return None
t1 = self._loop.time()
while conns:
proto, t0 = conns.pop()
if proto.is_connected():
if t1 - t0 > self._keepalive_timeout:
transport = proto.close()
# only for SSL transports
if key[-1] and not self._cleanup_closed_disabled:
self._cleanup_closed_transports.append(transport)
else:
if not conns:
# The very last connection was reclaimed: drop the key
del self._conns[key]
return proto
# No more connections: drop the key
del self._conns[key]
return None
def _release_waiter(self):
# always release only one waiter
if self._limit:
# if we have limit and we have available
if self._limit - len(self._acquired) > 0:
for key, waiters in self._waiters.items():
if waiters:
if not waiters[0].done():
waiters[0].set_result(None)
break
elif self._limit_per_host:
# if we have dont have limit but have limit per host
# then release first available
for key, waiters in self._waiters.items():
if waiters:
if not waiters[0].done():
waiters[0].set_result(None)
break
def _release_acquired(self, key, proto):
if self._closed:
# acquired connection is already released on connector closing
return
try:
self._acquired.remove(proto)
self._drop_acquired_per_host(key, proto)
except KeyError: # pragma: no cover
# this may be result of undetermenistic order of objects
# finalization due garbage collection.
pass
else:
self._release_waiter()
def _release(self, key, protocol, *, should_close=False):
if self._closed:
# acquired connection is already released on connector closing
return
self._release_acquired(key, protocol)
if self._force_close:
should_close = True
if should_close or protocol.should_close:
transport = protocol.close()
if key[-1] and not self._cleanup_closed_disabled:
self._cleanup_closed_transports.append(transport)
else:
conns = self._conns.get(key)
if conns is None:
conns = self._conns[key] = []
conns.append((protocol, self._loop.time()))
if self._cleanup_handle is None:
self._cleanup_handle = helpers.weakref_handle(
self, '_cleanup', self._keepalive_timeout, self._loop)
async def _create_connection(self, req, traces=None):
raise NotImplementedError()
class _DNSCacheTable:
def __init__(self, ttl=None):
self._addrs_rr = {}
self._timestamps = {}
self._ttl = ttl
def __contains__(self, host):
return host in self._addrs_rr
def add(self, host, addrs):
self._addrs_rr[host] = (cycle(addrs), len(addrs))
if self._ttl:
self._timestamps[host] = monotonic()
def remove(self, host):
self._addrs_rr.pop(host, None)
if self._ttl:
self._timestamps.pop(host, None)
def clear(self):
self._addrs_rr.clear()
self._timestamps.clear()
def next_addrs(self, host):
loop, length = self._addrs_rr[host]
addrs = list(islice(loop, length))
# Consume one more element to shift internal state of `cycle`
next(loop)
return addrs
def expired(self, host):
if self._ttl is None:
return False
return self._timestamps[host] + self._ttl < monotonic()
class TCPConnector(BaseConnector):
"""TCP connector.
verify_ssl - Set to True to check ssl certifications.
fingerprint - Pass the binary sha256
digest of the expected certificate in DER format to verify
that the certificate the server presents matches. See also
https://en.wikipedia.org/wiki/Transport_Layer_Security#Certificate_pinning
resolver - Enable DNS lookups and use this
resolver
use_dns_cache - Use memory cache for DNS lookups.
ttl_dns_cache - Max seconds having cached a DNS entry, None forever.
family - socket address family
local_addr - local tuple of (host, port) to bind socket to
keepalive_timeout - (optional) Keep-alive timeout.
force_close - Set to True to force close and do reconnect
after each request (and between redirects).
limit - The total number of simultaneous connections.
limit_per_host - Number of simultaneous connections to one host.
enable_cleanup_closed - Enables clean-up closed ssl transports.
Disabled by default.
loop - Optional event loop.
"""
def __init__(self, *, verify_ssl=True, fingerprint=None,
use_dns_cache=True, ttl_dns_cache=10,
family=0, ssl_context=None, ssl=None, local_addr=None,
resolver=None, keepalive_timeout=sentinel,
force_close=False, limit=100, limit_per_host=0,
enable_cleanup_closed=False, loop=None):
super().__init__(keepalive_timeout=keepalive_timeout,
force_close=force_close,
limit=limit, limit_per_host=limit_per_host,
enable_cleanup_closed=enable_cleanup_closed,
loop=loop)
self._ssl = _merge_ssl_params(ssl, verify_ssl, ssl_context,
fingerprint)
if resolver is None:
resolver = DefaultResolver(loop=self._loop)
self._resolver = resolver
self._use_dns_cache = use_dns_cache
self._cached_hosts = _DNSCacheTable(ttl=ttl_dns_cache)
self._throttle_dns_events = {}
self._family = family
self._local_addr = local_addr
def close(self):
"""Close all ongoing DNS calls."""
for ev in self._throttle_dns_events.values():
ev.cancel()
super().close()
@property
def family(self):
"""Socket family like AF_INET."""
return self._family
@property
def use_dns_cache(self):
"""True if local DNS caching is enabled."""
return self._use_dns_cache
def clear_dns_cache(self, host=None, port=None):
"""Remove specified host/port or clear all dns local cache."""
if host is not None and port is not None:
self._cached_hosts.remove((host, port))
elif host is not None or port is not None:
raise ValueError("either both host and port "
"or none of them are allowed")
else:
self._cached_hosts.clear()
async def _resolve_host(self, host, port, traces=None):
if is_ip_address(host):
return [{'hostname': host, 'host': host, 'port': port,
'family': self._family, 'proto': 0, 'flags': 0}]
if not self._use_dns_cache:
if traces:
for trace in traces:
await trace.send_dns_resolvehost_start(host)
res = (await self._resolver.resolve(
host, port, family=self._family))
if traces:
for trace in traces:
await trace.send_dns_resolvehost_end(host)
return res
key = (host, port)
if (key in self._cached_hosts) and \
(not self._cached_hosts.expired(key)):
if traces:
for trace in traces:
await trace.send_dns_cache_hit(host)
return self._cached_hosts.next_addrs(key)
if key in self._throttle_dns_events:
if traces:
for trace in traces:
await trace.send_dns_cache_hit(host)
await self._throttle_dns_events[key].wait()
else:
if traces:
for trace in traces:
await trace.send_dns_cache_miss(host)
self._throttle_dns_events[key] = \
EventResultOrError(self._loop)
try:
if traces:
for trace in traces:
await trace.send_dns_resolvehost_start(host)
addrs = await \
asyncio.shield(self._resolver.resolve(host,
port,
family=self._family),
loop=self._loop)
if traces:
for trace in traces:
await trace.send_dns_resolvehost_end(host)
self._cached_hosts.add(key, addrs)
self._throttle_dns_events[key].set()
except BaseException as e:
# any DNS exception, independently of the implementation
# is set for the waiters to raise the same exception.
self._throttle_dns_events[key].set(exc=e)
raise
finally:
self._throttle_dns_events.pop(key)
return self._cached_hosts.next_addrs(key)
async def _create_connection(self, req, traces=None):
"""Create connection.
Has same keyword arguments as BaseEventLoop.create_connection.
"""
if req.proxy:
_, proto = await self._create_proxy_connection(
req,
traces=None
)
else:
_, proto = await self._create_direct_connection(
req,
traces=None
)
return proto
@staticmethod
@functools.lru_cache(None)
def _make_ssl_context(verified):
if verified:
return ssl.create_default_context()
else:
sslcontext = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
sslcontext.options |= ssl.OP_NO_SSLv2
sslcontext.options |= ssl.OP_NO_SSLv3
sslcontext.options |= ssl.OP_NO_COMPRESSION
sslcontext.set_default_verify_paths()
return sslcontext
def _get_ssl_context(self, req):
"""Logic to get the correct SSL context
0. if req.ssl is false, return None
1. if ssl_context is specified in req, use it
2. if _ssl_context is specified in self, use it
3. otherwise:
1. if verify_ssl is not specified in req, use self.ssl_context
(will generate a default context according to self.verify_ssl)
2. if verify_ssl is True in req, generate a default SSL context
3. if verify_ssl is False in req, generate a SSL context that
won't verify
"""
if req.is_ssl():
if ssl is None: # pragma: no cover
raise RuntimeError('SSL is not supported.')
sslcontext = req.ssl
if isinstance(sslcontext, ssl.SSLContext):
return sslcontext
if sslcontext is not None:
# not verified or fingerprinted
return self._make_ssl_context(False)
sslcontext = self._ssl
if isinstance(sslcontext, ssl.SSLContext):
return sslcontext
if sslcontext is not None:
# not verified or fingerprinted
return self._make_ssl_context(False)
return self._make_ssl_context(True)
else:
return None
def _get_fingerprint(self, req):
ret = req.ssl
if isinstance(ret, Fingerprint):
return ret
ret = self._ssl
if isinstance(ret, Fingerprint):
return ret
return None
async def _wrap_create_connection(self, *args,
req, client_error=ClientConnectorError,
**kwargs):
try:
return await self._loop.create_connection(*args, **kwargs)
except certificate_errors as exc:
raise ClientConnectorCertificateError(
req.connection_key, exc) from exc
except ssl_errors as exc:
raise ClientConnectorSSLError(req.connection_key, exc) from exc
except OSError as exc:
raise client_error(req.connection_key, exc) from exc
async def _create_direct_connection(self, req,
*, client_error=ClientConnectorError,
traces=None):
sslcontext = self._get_ssl_context(req)
fingerprint = self._get_fingerprint(req)
try:
hosts = await self._resolve_host(
req.url.raw_host,
req.port,
traces=traces)
except OSError as exc:
# in case of proxy it is not ClientProxyConnectionError
# it is problem of resolving proxy ip itself
raise ClientConnectorError(req.connection_key, exc) from exc
last_exc = None
for hinfo in hosts:
host = hinfo['host']
port = hinfo['port']
try:
transp, proto = await self._wrap_create_connection(
self._factory, host, port,
ssl=sslcontext, family=hinfo['family'],
proto=hinfo['proto'], flags=hinfo['flags'],
server_hostname=hinfo['hostname'] if sslcontext else None,
local_addr=self._local_addr,
req=req, client_error=client_error)
except ClientConnectorError as exc:
last_exc = exc
continue
if req.is_ssl() and fingerprint:
try:
fingerprint.check(transp)
except ServerFingerprintMismatch as exc:
transp.close()
if not self._cleanup_closed_disabled:
self._cleanup_closed_transports.append(transp)
last_exc = exc
continue
return transp, proto
else:
raise last_exc
async def _create_proxy_connection(self, req, traces=None):
headers = {}
if req.proxy_headers is not None:
headers = req.proxy_headers
headers[hdrs.HOST] = req.headers[hdrs.HOST]
proxy_req = ClientRequest(
hdrs.METH_GET, req.proxy,
headers=headers,
auth=req.proxy_auth,
loop=self._loop,
ssl=req.ssl)
# create connection to proxy server
transport, proto = await self._create_direct_connection(
proxy_req, client_error=ClientProxyConnectionError)
auth = proxy_req.headers.pop(hdrs.AUTHORIZATION, None)
if auth is not None:
if not req.is_ssl():
req.headers[hdrs.PROXY_AUTHORIZATION] = auth
else:
proxy_req.headers[hdrs.PROXY_AUTHORIZATION] = auth
if req.is_ssl():
sslcontext = self._get_ssl_context(req)
# For HTTPS requests over HTTP proxy
# we must notify proxy to tunnel connection
# so we send CONNECT command:
# CONNECT www.python.org:443 HTTP/1.1
# Host: www.python.org
#
# next we must do TLS handshake and so on
# to do this we must wrap raw socket into secure one
# asyncio handles this perfectly
proxy_req.method = hdrs.METH_CONNECT
proxy_req.url = req.url
key = (req.host, req.port, req.ssl)
conn = Connection(self, key, proto, self._loop)
proxy_resp = proxy_req.send(conn)
try:
resp = await proxy_resp.start(conn, True)
except BaseException:
proxy_resp.close()
conn.close()
raise
else:
conn._protocol = None
conn._transport = None
try:
if resp.status != 200:
raise ClientHttpProxyError(
proxy_resp.request_info,
resp.history,
code=resp.status,
message=resp.reason,
headers=resp.headers)
rawsock = transport.get_extra_info('socket', default=None)
if rawsock is None:
raise RuntimeError(
"Transport does not expose socket instance")
# Duplicate the socket, so now we can close proxy transport
rawsock = rawsock.dup()
finally:
transport.close()
transport, proto = await self._wrap_create_connection(
self._factory, ssl=sslcontext, sock=rawsock,
server_hostname=req.host,
req=req)
finally:
proxy_resp.close()
return transport, proto
class UnixConnector(BaseConnector):
"""Unix socket connector.
path - Unix socket path.
keepalive_timeout - (optional) Keep-alive timeout.
force_close - Set to True to force close and do reconnect
after each request (and between redirects).
limit - The total number of simultaneous connections.
limit_per_host - Number of simultaneous connections to one host.
loop - Optional event loop.
"""
def __init__(self, path, force_close=False, keepalive_timeout=sentinel,
limit=100, limit_per_host=0, loop=None):
super().__init__(force_close=force_close,
keepalive_timeout=keepalive_timeout,
limit=limit, limit_per_host=limit_per_host, loop=loop)
self._path = path
@property
def path(self):
"""Path to unix socket."""
return self._path
async def _create_connection(self, req, traces=None):
try:
_, proto = await self._loop.create_unix_connection(
self._factory, self._path)
except OSError as exc:
raise ClientConnectorError(req.connection_key, exc) from exc
return proto
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